Yes, find the new packages' names:
dpkg -l | grep 5.8.0-050800
and then purge them:
sudo dpkg -P ...
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https://bugs.launchpad.net/bugs/1890418
Title:
i915 does not expose
Daniel I successfully ran the dpkg process as you illustrated but it
then failed to boot, so now I must manually selected the 5.4 version in
order to get to this boot. Is there a way to reverse that?
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To test kernel 5.8 you need to download all these packages EXCEPT the
"lowlatency" ones:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.8/amd64/
and then install them all at once:
sudo dpkg -i *.deb
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The attachment in comment #10 confirms the problem is happening at a low
level in the kernel. Although Xorg could override that if it was smart
enough. In theory you can do it manually but would need to become an
expert at crafting modeline entries to get it working. I don't know how
myself. If
I found the information, at section 3.4 of the manual
https://dlcdnets.asus.com/pub/ASUS/LCD%20Monitors/PB287/PB287Q_English.pdf
where VESA / IBM Modes Support Timing (DP/HDMI) reaches 4k but CEA-861
Formats Supported Timing (HDMI/MHL) only reach 1920
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Regarding HDMI version the spec which I gave a link to claims;
True Resolution : 3840x2160 at 60Hz (DisplayPort) ,3840x2160 at 30Hz (HDMI)
Some while ago I was researching this issue and found a specification
page on the ASUS website which showed two formats for declaring the
frame rate, one
Thanks for your work
I just bought and tried a new 4K hdmi cable, with no change. I noticed
that the monitor has TWO inputs, HDMI and HDMI/MHL (it had been plugged
into HDMI) but switching this to HDMI/MHL gave no result.
I am using MATE but the same issue occurs in several flavours of Ubuntu
This might have been fixed in the Intel graphics driver in a newer
kernel. Can you please test this one?
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.8/
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Please also run this command:
grep . /sys/class/drm/*/modes > kernel-modes.txt
and attach the resulting text file here.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
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