From mboxrd@z Thu Jan 1 00:00:00 1970 From: Geert Uytterhoeven Date: Thu, 22 Jan 2015 20:42:23 +0000 Subject: Re: fbcon gives mirrored fonts on monochrome display Message-Id: List-Id: References: <54C145B8.6080204@tronnes.org> In-Reply-To: <54C145B8.6080204@tronnes.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit To: linux-fbdev@vger.kernel.org Hi Noralf, On Thu, Jan 22, 2015 at 9:38 PM, Noralf Trønnes wrote: > Den 22.01.2015 20:59, skrev Geert Uytterhoeven: >> On Thu, Jan 22, 2015 at 8:55 PM, Noralf Trønnes wrote: >>> Den 22.01.2015 20:44, skrev Geert Uytterhoeven: >>>> On Thu, Jan 22, 2015 at 7:47 PM, Noralf Trønnes >>>> wrote: >>>>> I'm playing with a SSD1306 128x64 monochrome display and fbcon gives me >>>>> mirrored fonts and some extra lines. >>> $ zgrep CONFIG_FB_CFB_REV_PIXELS_IN_BYTE /proc/config.gz >>> # CONFIG_FB_CFB_REV_PIXELS_IN_BYTE is not set >>> >>>> Does your driver set FB_NONSTD_REV_PIX_IN_B? >>> >>> No it doesn't. I also tried setting it now, with no effect: >>> info->var.nonstd = FB_NONSTD_REV_PIX_IN_B; >> >> The latter only seems to matter if CONFIG_FB_CFB_REV_PIXELS_IN_BYTE >> is set, so please try the config option first. > > > $ zgrep CONFIG_FB_CFB_REV_PIXELS_IN_BYTE /proc/config.gz > CONFIG_FB_CFB_REV_PIXELS_IN_BYTE=y > > $ dmesg > [ 365.595787] nonstd = 2 > > It didn't change anything. > > I looked up the code that is affected by this change, and only the cbf*.c > files use the rev/swap/shift functions from fb_draw.h > I use the sys_* modules not cbf* One more thing that's no longer in sync... Ideally, the cfb* and sys* versions are identical, except that the former operates on MMIO, and the latter on RAM. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds