This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:
apport-collect 1655421
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1655421
Title:
nouveau driver being too conservative about HDMI pixel clock, barring
usage of native resolution on 4K displays over HDMI
Status in linux package in Ubuntu:
Incomplete
Bug description:
Jan 10 18:56:03 frode-MacBookPro kernel: [ 4.993311]
[drm:drm_add_edid_modes.part.22 [drm]] HDMI: DVI dual 0, max TMDS clock 300000
kHz
Jan 10 18:56:03 frode-MacBookPro kernel: [ 4.993315] nouveau 0000:01:00.0:
DRM: native mode from largest: 1920x1080@60
Jan 10 18:56:03 frode-MacBookPro kernel: [ 4.993342]
[drm:drm_mode_debug_printmodeline [drm]] Modeline 69:"3840x2160" 30 297000 3840
4016 4104 4400 2160 2168 2178 2250 0x48 0x5
Jan 10 18:56:03 frode-MacBookPro kernel: [ 4.993348]
[drm:drm_mode_prune_invalid [drm]] Not using 3840x2160 mode: CLOCK_HIGH
Jan 10 18:56:03 frode-MacBookPro kernel: [ 4.993353]
[drm:drm_mode_debug_printmodeline [drm]] Modeline 73:"2560x1440" 60 241500 2560
2608 2640 2720 1440 1443 1448 1481 0x40 0x9
Jan 10 18:56:03 frode-MacBookPro kernel: [ 4.993358]
[drm:drm_mode_prune_invalid [drm]] Not using 2560x1440 mode: CLOCK_HIGH
Jan 10 18:56:03 frode-MacBookPro kernel: [ 4.993363]
[drm:drm_mode_debug_printmodeline [drm]] Modeline 104:"3840x2160" 25 297000
3840 4896 4984 5280 2160 2168 2178 2250 0x40 0x5
Jan 10 18:56:03 frode-MacBookPro kernel: [ 4.993368]
[drm:drm_mode_prune_invalid [drm]] Not using 3840x2160 mode: CLOCK_HIGH
Jan 10 18:56:03 frode-MacBookPro kernel: [ 4.993373]
[drm:drm_mode_debug_printmodeline [drm]] Modeline 105:"3840x2160" 24 297000
3840 5116 5204 5500 2160 2168 2178 2250 0x40 0x5
Jan 10 18:56:03 frode-MacBookPro kernel: [ 4.993378]
[drm:drm_mode_prune_invalid [drm]] Not using 3840x2160 mode: CLOCK_HIGH
Jan 10 18:56:03 frode-MacBookPro kernel: [ 4.993383]
[drm:drm_mode_debug_printmodeline [drm]] Modeline 106:"3840x2160" 30 296703
3840 4016 4104 4400 2160 2168 2178 2250 0x40 0x5
Jan 10 18:56:03 frode-MacBookPro kernel: [ 4.993387]
[drm:drm_mode_prune_invalid [drm]] Not using 3840x2160 mode: CLOCK_HIGH
Jan 10 18:56:03 frode-MacBookPro kernel: [ 4.993392]
[drm:drm_mode_debug_printmodeline [drm]] Modeline 116:"3840x2160" 24 296703
3840 5116 5204 5500 2160 2168 2178 2250 0x40 0x5
Jan 10 18:56:03 frode-MacBookPro kernel: [ 4.993397]
[drm:drm_mode_prune_invalid [drm]] Not using 3840x2160 mode: CLOCK_HIGH
However it is perfectly valid to use higher pixel clock on some
graphic cards.
This patch will allow the end-user to adjust the pixel clock with the hdmimhz
kernel parameter until the detection code gets good enough:
https://github.com/torvalds/linux/commit/1a0c96c075bb4517d4ce4fb6750ee0a3cf38714c
This page contains a lot of useful information and lead me to a sollution to
my problem:
https://www.elstel.org/software/hunt-for-4K-UHD-2160p.html.en
I think this is worthy of consideration for backport to the Xenial
kernel as not being able to use the most recent LTS version of Ubuntu
Desktop with current hardware is a drag.
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