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SubjectRe: [PATCH]: Fix radeon blanking return value.
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On Wed, 2007-02-28 at 16:20 -0800, David Miller wrote:
> If you'll recall, over a year ago, I pointed out that the current
> Radeon driver erroneously returns -EINVAL for valid blanking codes,
> here is a link to that thread:
>
> http://lkml.org/lkml/2006/1/28/6
>
> No other driver does this, and it confuses the X server into thinking
> that the device does not support blanking properly.
>
> As a result I have to switch to a console VC and back to the X server
> to unblank the screen, which is rediculious.
>
> I've had to do this for more than 3 years and I'm really tired of this
> problem still being around :-)
>
> I looked again and there is simply no reason for the Radeon driver to
> return -EINVAL for FB_BLANK_NORMAL. It claims it wants to do this in
> order to convince fbcon to blank in software, right here:
>
> if (fb_blank(info, blank))
> fbcon_generic_blank(vc, info, blank);
>
> to software blank the screen. But it only causes that to happen
> in the FB_BLANK_NORMAL case.
>
> That makes no sense because the Radeon code does this:
>
> val |= CRTC_DISPLAY_DIS;
>
> in the FB_BLANK_NORMAL case so should be blanking the hardware, and
> there is therefore no reason to SW blank by returning -EINVAL.
>
> Therefore I propose we finally apply the following patch. No other
> fbdev driver does this madness, and as I've shown above there is no
> justification for the behavior at all :-)

This was before radeonfb did not fully differentiate each blanking
levels. Currently, it is fixed, so I agree with this patch.

>
> Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Antonino Daplas <adaplas@gmail.com>

Tony


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