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Date:   Sun, 31 Mar 2019 13:19:24 +0100
From:   Sudip Mukherjee <>
To:     Yifeng Li <>
Cc:     Teddy Wang <>,
        Bartlomiej Zolnierkiewicz <>,,,,
Subject: Re: [PATCH 3/8] fbdev: sm712fb: fix VRAM detection, don't set

On Sun, Mar 17, 2019 at 06:24:59AM +0800, Yifeng Li wrote:
> On a Thinkpad s30 (Pentium III / i440MX, Lynx3DM), the amount of Video
> RAM is not detected correctly by the xf86-video-siliconmotion driver.
> This is because sm712fb overwrites the GPR71 Scratch Pad Register, which
> is set by BIOS on x86 and used to indicate amount of VRAM.
> Other Scratch Pad Registers, including GPR70/74/75, don't have the same
> side-effect, but overwriting to them is still questionable, as they are
> not related to modesetting.
> Stop writing to SR70/71/74/75 (a.k.a GPR70/71/74/75).
> Signed-off-by: Yifeng Li <>
> Cc:  # v4.4+

Tested-by: Sudip Mukherjee <>


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