Re: Limit DRM resolution

[Hauke Fath <hf%spg.tu-darmstadt.de@localhost>]

On Fri, 20 Mar 2020 09:19:58 +0100, Thomas Klausner wrote:
> I need this as a workaround for an older graphics card which supports
> only a smaller resolution than the monitor, but our DRM code is not
> smart enough to check the card doesn't support it.

Funny that - I seem to have the opposite problem (netbsd-9):

[     4.030492] radeondrmkmsfb0 at radeon0
[     4.030492] radeondrmkmsfb0: framebuffer at 0xffff8180b00ae000, 
size 1920x1080, depth 32, stride 7680
[     4.080511] no data for est. mode 640x480x67
[     4.130530] wsdisplay0 at radeondrmkmsfb0 kbdmux 1: console 
(default, vt100 emulation), using wskbd0
[     4.155163] wsmux1: connecting to wsdisplay0

even though the display says

[    81.998] (II) RADEON(0): Supported detailed timing:
[    81.998] (II) RADEON(0): clock: 241.5 MHz   Image Size:  708 x 398 
mm
[    81.998] (II) RADEON(0): h_active: 2560  h_sync: 2608  h_sync_end 
2640 h_blank_end 2720 h_border: 0
[    81.998] (II) RADEON(0): v_active: 1440  v_sync: 1443  v_sync_end 
1448 v_blanking: 1481 v_border: 0
[    81.998] (II) RADEON(0): Ranges: V min: 50 V max: 75 Hz, H min: 30 
H max: 90 kHz, PixClock max 255 MHz
[    81.998] (II) RADEON(0): Monitor name: S32D850

Cheerio,
Hauke

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