[Bug 44811] missing dual display (single only) after switching to KMS driver on radeon firegl x1 (R300)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=44811

--- Comment #12 from Alex Deucher <agd5f at yahoo.com> 2012-01-30 07:32:25 PST ---
There are two 1680x1050 modes in the EDID:

1. 1680x1050 @ 146.25 Mhz
[   117.660] (II) RADEON(0): #2: hsize: 1680  vsize 1050  refresh: 60  vid: 179
[   117.661] (II) RADEON(0): Modeline "1680x1050"x60.0  146.25  1680 1784 1960
2240  1050 1053 1059 1089 -hsync +vsync (65.3 kHz)

2. 1680x1050 @ 119.00 Mhz
[   117.660] (II) RADEON(0): clock: 119.0 MHz   Image Size:  474 x 296 mm
[   117.660] (II) RADEON(0): h_active: 1680  h_sync: 1728  h_sync_end 1760
h_blank_end 1840 h_border: 0
[   117.660] (II) RADEON(0): v_active: 1050  v_sync: 1053  v_sync_end 1059
v_blanking: 1080 v_border: 0
[   117.661] (II) RADEON(0): Modeline "1680x1050"x59.9  119.00  1680 1728 1760
1840  1050 1053 1059 1080 +hsync -vsync (64.7 kHz)

The 119Mhz mode is the monitor's preferred mode.  The problem seems to be the
monitor doesn't seem to care for the 146.25Mhz mode while the 119Mhz mode works
fine.  For some reason UMS doesn't add the 146.25Mhz mode (possibly the xserver
doesn't add 1680x1050 modes in the standard timing block); with KMS, the kernel
parses the EDID and adds the 146.25Mhz mode.

Does switching to a different mode on the problematic display fix it?

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