Bug 14575

Summary: using a hdmi connector frame buffer resolution maxes out at 1920x1200
Product: Drivers Reporter: Wil Reichert (wil.reichert)
Component: Video(DRI - non Intel)Assignee: drivers_video-dri
Status: CLOSED DOCUMENTED    
Severity: normal CC: alan, alexdeucher
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 2.6.32-rc6 Subsystem:
Regression: No Bisected commit-id:
Attachments: dmesg with hdmi connected
dmesg with dvi connector attached

Description Wil Reichert 2009-11-10 05:54:37 UTC
Created attachment 23720 [details]
dmesg with hdmi connected

Using a Radeon 4890 / Dell 3008WFP, a day or 2 old git kernel & kms built into
the kernel.  Using a DVI connector the kernel boots into the native panel resolution of 2560x1600, when using the hdmi connection it defaults to 1920x1200.  Even after booting into X I was unable to set the native resolution.  dmesg attached.
Comment 1 Wil Reichert 2009-11-10 05:55:14 UTC
Created attachment 23721 [details]
dmesg with dvi connector attached
Comment 2 Alex Deucher 2009-11-10 17:42:59 UTC
HDMI-A only supports single link tmds (max pixel clock of 165 Mhz).  2560x1600 requires dual link tmds which is only available over DVI in your case.
Comment 3 Wil Reichert 2009-11-10 18:46:37 UTC
Doh, should have read the spec sheet better.  Thanks.