From mboxrd@z Thu Jan 1 00:00:00 1970 From: Geert Uytterhoeven Date: Thu, 22 Jan 2015 19:59:11 +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 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. >>> fbdev config: >>> info->var.bits_per_pixel = 1; >>> info->fix.visual = FB_VISUAL_MONO10; >>> info->var.red.length = 1; >>> info->var.red.offset = 0; >>> info->var.green.length = 1; >>> info->var.green.offset = 0; >>> info->var.blue.length = 1; >>> info->var.blue.offset = 0; >>> Uses: sys_fillrect, sys_copyarea, sys_imageblit (and deferred_io) >>> >>> System: Raspberry Pi, ARM, Linux 3.18.3 >>> >>> Does anyone see what this might be? >> >> What's the value on CONFIG_FB_CFB_REV_PIXELS_IN_BYTE in your .config? > > $ 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. 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