Bug#573849: xserver-xorg-video-radeon: Be verbose about discarding modes

[Bas Wijnen]

Package: xserver-xorg-video-radeon
Version: 6.12.5-1
Severity: wishlist

Since fairly recently (a few months, I think), by Radeon refuses to set
my monitor to 1600x1200.  Looking at the server log, I found (in random
order):

(II) RADEON(0): #6: hsize: 1600  vsize 1200  refresh: 60  vid: 16553
(II) RADEON(0): Modeline "1600x1200"x0.0  162.00  1600 1664 1856 2160 1200 1201 1204 1250 +hsync +vsync (75.0 kHz)
(II) RADEON(0): Ranges: V min: 56 V max: 75 Hz, H min: 31 H max: 81 kHz, PixClock max 170 MHz
(II) RADEON(0): Not using mode "1600x1200" (mode clock too high)

This makes no sense.  It should be able to go up to 170 MHz, but it
refuses 162 MHz.  In the source I found:

    /* clocks over 135 MHz have heat issues with DVI on RV100 */
    if ((radeon_output->MonType == MT_DFP) &&
        (info->ChipFamily == CHIP_FAMILY_RV100) &&
        (pMode->Clock > 135000))
            return MODE_CLOCK_HIGH;

This explains why it refuses the mode.

Looking at the source should not be required for understanding the log
file.  Please make it more readable by adding a line about the heat
issues.  It may also be a good idea to allow overriding the check.  I
never had any trouble using 1600x1200 with this card and monitor.

Thanks,
Bas
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