Hi all!
I recently bought a HP ZR22w IPS monitor to use with my Thinkpad W500 running Arch Linux 64-bit. As it turns out, Kernel Mode Setting (KMS) + DisplayPort (DP) appears to be broken. When KMS+DP is used on boot, I get an error message on the monitor:
Inside X11, I am unable to get the screen going when KMS+DP is used. xrandr reports the screen being connected and that 1920x1080 is being sent to it. I still have the same error message.
If I turn off KMS, the monitor works just fine with DP and X11 and xrandr do their jobs.
If I use a DP->DVI adaptor and instead use the DVI connector on the monitor, KMS works just fine.
My guess is that the EDID handling is broken somehow on DP. I have tried adding various video= switches in grub to force the resolution but I am not really sure how apply them to the DisplayPort (unable to find any documentation on this) or whether it matters since the problem seems to be that the kernel is unaware it sends an incorrect video signal to the monitor.
The only reference I have found to this monitor and KMS is this one, but I am not sure what to make of it:
http://www.spinics.net/lists/dri-devel/msg13061.html
I would much appreciate any pointers!
EDIT:
I booted Fedora 14 with an 2.6.35 kernel and that one works with KMS + DP.
I recently bought a HP ZR22w IPS monitor to use with my Thinkpad W500 running Arch Linux 64-bit. As it turns out, Kernel Mode Setting (KMS) + DisplayPort (DP) appears to be broken. When KMS+DP is used on boot, I get an error message on the monitor:
Code:
Input signal Out of Range Change Settings to 1920 x 1080 - 60Hz
If I turn off KMS, the monitor works just fine with DP and X11 and xrandr do their jobs.
If I use a DP->DVI adaptor and instead use the DVI connector on the monitor, KMS works just fine.
My guess is that the EDID handling is broken somehow on DP. I have tried adding various video= switches in grub to force the resolution but I am not really sure how apply them to the DisplayPort (unable to find any documentation on this) or whether it matters since the problem seems to be that the kernel is unaware it sends an incorrect video signal to the monitor.
The only reference I have found to this monitor and KMS is this one, but I am not sure what to make of it:
http://www.spinics.net/lists/dri-devel/msg13061.html
I would much appreciate any pointers!
EDIT:
I booted Fedora 14 with an 2.6.35 kernel and that one works with KMS + DP.
Comment