Second monitor doesn't work on Kernel 4.15
I upgraded to Kubuntu 18.04 and my second monitor is no longer detected.
Its connected via dvi-vga adapter to my gfx card and my main display is via hdmi. At kernel 4.14 it was working fine (tested other distros with kernel 4.14 and 4.15 and it still doesnt get detected at 4.15 ). Here's the output of xrandr ( GPU: Sapphire R9 380X )
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
HDMI-A-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 509mm x 286mm
1920x1080 60.00*+ 50.00 59.94
1680x1050 60.00
1600x900 60.00
1280x1024 75.02 60.02
1440x900 60.00
1280x800 60.00
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
DVI-D-0 disconnected (normal left inverted right x axis y axis)
DVI-D-1 disconnected (normal left inverted right x axis y axis)
I might have found a solution from someone with a similar problem but i don't know where i should add this.
With Linux 4.15, AMDGPU DC is just enabled by default for Vega
hardware. If you are on GCN 1.1 or newer with AMDGPU and want to use
DC, you need to use the amdgpu.dc=1 kernel module parameter for
activation.
Source: https://www.phoronix.com/scan.php?page=news_item&px=AMDGPU-DC-Accepted
Where do i have to add this?
kernel display
asked May 2 '18 at 12:52
DergonDergon
551312
add a comment |
I upgraded to Kubuntu 18.04 and my second monitor is no longer detected.
Its connected via dvi-vga adapter to my gfx card and my main display is via hdmi. At kernel 4.14 it was working fine (tested other distros with kernel 4.14 and 4.15 and it still doesnt get detected at 4.15 ). Here's the output of xrandr ( GPU: Sapphire R9 380X )
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
HDMI-A-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 509mm x 286mm
1920x1080 60.00*+ 50.00 59.94
1680x1050 60.00
1600x900 60.00
1280x1024 75.02 60.02
1440x900 60.00
1280x800 60.00
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
DVI-D-0 disconnected (normal left inverted right x axis y axis)
DVI-D-1 disconnected (normal left inverted right x axis y axis)
I might have found a solution from someone with a similar problem but i don't know where i should add this.
With Linux 4.15, AMDGPU DC is just enabled by default for Vega
hardware. If you are on GCN 1.1 or newer with AMDGPU and want to use
DC, you need to use the amdgpu.dc=1 kernel module parameter for
activation.
Source: https://www.phoronix.com/scan.php?page=news_item&px=AMDGPU-DC-Accepted
Where do i have to add this?
kernel display
asked May 2 '18 at 12:52
DergonDergon
551312
add a comment |
I upgraded to Kubuntu 18.04 and my second monitor is no longer detected.
Its connected via dvi-vga adapter to my gfx card and my main display is via hdmi. At kernel 4.14 it was working fine (tested other distros with kernel 4.14 and 4.15 and it still doesnt get detected at 4.15 ). Here's the output of xrandr ( GPU: Sapphire R9 380X )
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
HDMI-A-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 509mm x 286mm
1920x1080 60.00*+ 50.00 59.94
1680x1050 60.00
1600x900 60.00
1280x1024 75.02 60.02
1440x900 60.00
1280x800 60.00
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
DVI-D-0 disconnected (normal left inverted right x axis y axis)
DVI-D-1 disconnected (normal left inverted right x axis y axis)
I might have found a solution from someone with a similar problem but i don't know where i should add this.
With Linux 4.15, AMDGPU DC is just enabled by default for Vega
hardware. If you are on GCN 1.1 or newer with AMDGPU and want to use
DC, you need to use the amdgpu.dc=1 kernel module parameter for
activation.
Source: https://www.phoronix.com/scan.php?page=news_item&px=AMDGPU-DC-Accepted
Where do i have to add this?
kernel display
asked May 2 '18 at 12:52
DergonDergon
551312
I upgraded to Kubuntu 18.04 and my second monitor is no longer detected.
Its connected via dvi-vga adapter to my gfx card and my main display is via hdmi. At kernel 4.14 it was working fine (tested other distros with kernel 4.14 and 4.15 and it still doesnt get detected at 4.15 ). Here's the output of xrandr ( GPU: Sapphire R9 380X )
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
HDMI-A-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 509mm x 286mm
1920x1080 60.00*+ 50.00 59.94
1680x1050 60.00
1600x900 60.00
1280x1024 75.02 60.02
1440x900 60.00
1280x800 60.00
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
DVI-D-0 disconnected (normal left inverted right x axis y axis)
DVI-D-1 disconnected (normal left inverted right x axis y axis)
I might have found a solution from someone with a similar problem but i don't know where i should add this.
With Linux 4.15, AMDGPU DC is just enabled by default for Vega
hardware. If you are on GCN 1.1 or newer with AMDGPU and want to use
DC, you need to use the amdgpu.dc=1 kernel module parameter for
activation.
Source: https://www.phoronix.com/scan.php?page=news_item&px=AMDGPU-DC-Accepted
Where do i have to add this?
kernel display
kernel display
asked May 2 '18 at 12:52
DergonDergon
551312
asked May 2 '18 at 12:52
DergonDergon
551312
asked May 2 '18 at 12:52
DergonDergon
551312
asked May 2 '18 at 12:52
DergonDergon
551312
asked May 2 '18 at 12:52
DergonDergon
551312
551312
add a comment |
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "89"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2faskubuntu.com%2fquestions%2f1031080%2fsecond-monitor-doesnt-work-on-kernel-4-15%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Ask Ubuntu!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2faskubuntu.com%2fquestions%2f1031080%2fsecond-monitor-doesnt-work-on-kernel-4-15%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
