Bug 35398

Summary: External monitor max resolution 1024x768 detected
Product: xorg Reporter: Radu Andries <admiral0>
Component: Driver/RadeonAssignee: xf86-video-ati maintainers <xorg-driver-ati>
Status: RESOLVED FIXED QA Contact: Xorg Project Team <xorg-team>
Severity: major    
Priority: medium CC: mrmazda
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
possible fix none

Description Radu Andries 2011-03-17 15:34:36 UTC 
Resolution for monitor is 1680x1050.

Xorg -version 
X.Org X Server 1.9.4.901 (1.9.5 RC 1)
Kernel : 2.6.38-ARCH (no patches, just logo changed)
xorg radeon from git 2011-03-04. Using gallium.


HW is  a laptop acer 4820TG with intel-ati combo. It's not a regression. This never worked for me.

Intel card detects monitor correctly.
Comment 1 Alex Deucher 2011-03-17 15:57:48 UTC 
Are you using switcheroo?  Does the monitor work properly when you select the discrete card in the bios?  I suspect the i2c mux is not getting swapped properly when you switch between the gpus.
Comment 2 Radu Andries 2011-03-19 13:04:08 UTC 
Using vga_switcheroo.

played with "xrandr --addmode" and 1680x1050 work, so it's a detection problem.
Comment 3 Alex Deucher 2011-03-19 13:07:46 UTC 
(In reply to comment #2)
> Using vga_switcheroo.
> 
> played with "xrandr --addmode" and 1680x1050 work, so it's a detection problem.

The i2c mux is not getting swapped properly when you switch between the gpus.
Comment 4 Alex Deucher 2011-03-19 13:09:27 UTC 
(In reply to comment #2)
> Using vga_switcheroo.
> 
> played with "xrandr --addmode" and 1680x1050 work, so it's a detection problem.

The i2c mux is not getting swapped properly when you switch between the gpus.  There's probably some additional set of acpi calls needed for your system.
Comment 5 Radu Andries 2011-03-19 15:13:12 UTC 
How can i help?
Comment 6 Alex Deucher 2011-05-05 22:37:19 UTC 
Created attachment 46383 [details] [review]
possible fix

Does this kernel patch help?
Comment 7 Radu Andries 2011-05-06 14:48:23 UTC 
Patch works as expected.
Comment 8 Alex Deucher 2011-05-08 22:49:52 UTC 
Patch sent upstream.

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