On 4/5/22 08:51, Michael Hennebry wrote:
On Tue, 5 Apr 2022, Samuel Sieb wrote:
Install "monitor-edid" and run it. See if it sees the correct monitor
resolutions.
$ monitor-edid
you must be root to run this program
That is strange. It worked for me as a user.
$ sudo monitor-edid
mmap /dev/mem: Permission denied
$ sudo sh
sh-5.1# whoami
root
sh-5.1# monitor-edid
mmap /dev/mem: Permission denied
sh-5.1# ls -l /dev/mem
crw-r-----. 1 root kmem 1, 1 Apr 5 02:58 /dev/mem
sh-5.1#
I wonder if it's because you have secure boot enabled.
Had it worked, would the screen have changed instantly?
No, that just lists the available modes of the monitor. I was trying to
check if the EDID was working properly.
Another way that might work with secure boot enabled is to use
"decode-edid" instead. Install it, then run "find /sys -name edid". On
my system, that gives me:
/sys/devices/pci0000:00/0000:00:08.1/0000:05:00.0/drm/card0/card0-HDMI-A-1/edid
/sys/devices/pci0000:00/0000:00:08.1/0000:05:00.0/drm/card0/card0-HDMI-A-2/edid
/sys/devices/pci0000:00/0000:00:08.1/0000:05:00.0/drm/card0/card0-DP-1/edid
My monitor is connected to "HDMI-A-2". If you don't know which one,
then just cat each one until you get a bunch of garbage on the terminal.
Then run the following, but replace with the right path.
edid-decode <
/sys/devices/pci0000:00/0000:00:08.1/0000:05:00.0/drm/card0/card0-HDMI-A-2/edid
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