Bug 42616

Summary:	Radeon Kernel Mode Setting sets wrong mode
Product:	Drivers	Reporter:	W Thomas Jones (thomas.jones)
Component:	Video(DRI - non Intel)	Assignee:	drivers_video-dri
Status:	NEW ---
Severity:	normal	CC:	alexdeucher, szg00000, xerofoify
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:		Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	UMS Xorg.0.log xrandr --verbose UMS dmesg UMS dmesg KMS KMS Xorg log KMS xrandr --verbose

Description W Thomas Jones 2012-01-20 18:23:13 UTC

I have a Radeon HD 3470, connected to a Dell P2010H monitor via Display Port.

The monitor's native resolution is 1600x900, and everything works correctly with UMS, however if I use KMS I cannot use that mode, I can use at least 1024x768, 1280x1024, and 1152x864 with KMS, but no matter how I try I cannot get it to work in 1600x900. I have tried with the CVT timings, (reduced blanking and not) and with the ones provided in the monitor's EDID.

If I attempt to set any of those modes (the 1600x900) with KMS on the monitor claims that I'm using an unsupported mode. UMS works just fine though.

I'm running Fedora, and I don't think this is a regression in the kernel since I don't think this computer has ever worked with KMS.

Right now what I've done is I have set the kernel command line to boot with 1152x864 and KMS, then I tried to use xrandr to change modes and the monitor just complained.

dmesg doesn't seem to have anything useful to say, and neither does Xorg.0.log

Comment 1 Alex Deucher 2012-01-20 19:13:28 UTC

Please attach your xorg log, 'xrandr --verbose' output, and dmesg output from both KMS and UMS.

Comment 2 W Thomas Jones 2012-01-20 19:45:17 UTC

Created attachment 72137 [details]
UMS Xorg.0.log

Comment 3 W Thomas Jones 2012-01-20 19:47:03 UTC

Created attachment 72138 [details]
xrandr --verbose UMS

the "1600x900Dell" mode is from me explicitly adding a modeline from the EDID data while I was trying to make it work with KMS

Comment 4 W Thomas Jones 2012-01-20 20:11:38 UTC

Created attachment 72139 [details]
dmesg UMS

Comment 5 W Thomas Jones 2012-01-20 20:11:54 UTC

Created attachment 72140 [details]
dmesg KMS

Comment 6 W Thomas Jones 2012-01-20 20:12:08 UTC

Created attachment 72141 [details]
KMS Xorg log

Comment 7 W Thomas Jones 2012-01-20 20:12:25 UTC

Created attachment 72142 [details]
KMS xrandr --verbose

Comment 8 xerofoify 2014-06-26 04:47:28 UTC

Please check to see if this bug is fixed with a newer kernel.
Cheers Nick