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Date:   Sun, 31 Mar 2019 13:20:28 +0100
From:   Sudip Mukherjee <>
To:     Yifeng Li <>
Cc:     Teddy Wang <>,
        Bartlomiej Zolnierkiewicz <>,,,,
Subject: Re: [PATCH 6/8] fbdev: sm712fb: fix crashes and garbled display
 during DPMS modesetting.

On Sun, Mar 17, 2019 at 06:25:02AM +0800, Yifeng Li wrote:
> On a Thinkpad s30 (Pentium III / i440MX, Lynx3DM), blanking the display
> or starting the X server will crash and freeze the system, or garble the
> display.
> Experiments showed this problem can mostly be solved by adjusting the
> order of register writes. Also, sm712fb failed to consider the difference
> of clock frequency when unblanking the display, and programs the clock for
> SM712 to SM720.
> Fix them by adjusting the order of register writes, and adding an
> additional check for SM720 for programming the clock frequency.
> Signed-off-by: Yifeng Li <>
> Cc:  # v4.4+

Tested-by: Sudip Mukherjee <>


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