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Bug#825840: localechooser: image display inverts red and blue color

From Mathieu Malaterre <malat@debian.org>
Newsgroups linux.debian.bugs.dist
Subject Bug#825840: localechooser: image display inverts red and blue color
Date 2016-09-03 16:10 +0200
Message-ID <sdjNT-65r-7@gated-at.bofh.it> (permalink)
References <sd20F-3rR-5@gated-at.bofh.it> <sd2tH-3Bl-11@gated-at.bofh.it> <sdfAB-3qO-3@gated-at.bofh.it> <sdhCq-4zU-7@gated-at.bofh.it> <sdhM5-4Da-3@gated-at.bofh.it>
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Some more information. I do not believe this is a 'simple' missing
byteswap operation in bterm source code.

During debian-installer if I boot using:

> install32

I can observe the red/blue inversion (using an OFFb fb)

Now if I do:

> install32 video=offb:off

I *cannot* observe the red/blue inversion (using a radeonfb fb).

I did check in both case, that the fb are setup the same way at least
how I understand it. I can Ctrl+Alt+2 to switch to an alternate shell
during installation and then type:

Print in blue:

# dd=/dev/zero ibs=1K count=600 | tr '\000' '\001' > /dev/fb0

Print in red:

# dd=/dev/zero ibs=1K count=600 | tr '\000' '\004' > /dev/fb0

(I simply replace count=600 with count=1840 when using radeonfb)

So there is something very subbtle (at least to me) that makes bterm
have a different behavior in OFFb vs radeonfb cases.

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Bug#825840: localechooser: image display inverts red and blue color Mathieu Malaterre <malat@debian.org> - 2016-09-02 21:10 +0200
  Bug#825840: localechooser: image display inverts red and blue color Ben Hutchings <ben@decadent.org.uk> - 2016-09-02 21:40 +0200
    Bug#825840: localechooser: image display inverts red and blue color Mathieu Malaterre <malat@debian.org> - 2016-09-03 11:40 +0200
      Bug#825840: localechooser: image display inverts red and blue color Mathieu Malaterre <malat@debian.org> - 2016-09-03 13:50 +0200
        Bug#825840: localechooser: image display inverts red and blue color Mathieu Malaterre <malat@debian.org> - 2016-09-03 14:00 +0200
          Bug#825840: localechooser: image display inverts red and blue color Mathieu Malaterre <malat@debian.org> - 2016-09-03 16:10 +0200
            Bug#825840: localechooser: image display inverts red and blue color Samuel Thibault <sthibault@debian.org> - 2016-09-04 23:10 +0200
              Bug#825840: localechooser: image display inverts red and blue color Mathieu Malaterre <malat@debian.org> - 2016-09-05 07:40 +0200
                Bug#825840: localechooser: image display inverts red and blue color Samuel Thibault <sthibault@debian.org> - 2016-09-06 02:40 +0200
                Bug#825840: localechooser: image display inverts red and blue color Samuel Thibault <sthibault@debian.org> - 2016-09-06 08:10 +0200
                Bug#825840: localechooser: image display inverts red and blue color Mathieu Malaterre <malat@debian.org> - 2016-09-06 08:10 +0200
            Bug#825840: localechooser: image display inverts red and blue color Samuel Thibault <sthibault@debian.org> - 2016-09-06 01:20 +0200
              Bug#825840: localechooser: image display inverts red and blue color Samuel Thibault <sthibault@debian.org> - 2016-09-06 01:20 +0200

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